Add CI badge for README

README.md

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-![CIF syntax check](https://github.com/COMCIFS/cif_syntax_check_action/workflows/CIFSyntaxCheck/badge.svg)
+[![CIF syntax check](https://github.com/COMCIFS/magnetic_dic/actions/workflows/main.yml/badge.svg)](https://github.com/COMCIFS/magnetic_dic/actions)
 # CIF dictionary for magnetic studies
 This repository tracks the development of a CIF dictionary for describing magnetic structures.  As the version here may contain
 draft and not yet approved items, it should not be relied upon. The [official IUCr version](https://www.iucr.org/resources/cif/dictionaries/cif_mag) is the best reference.